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Zill & Dewar - Precalculus with Calc Previews 6/e (Homework)

James Finch

Math - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 12 / 22

Due : Sunday, January 27, 2030 00:00 EST

Last Saved : n/a Saving...  ()

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Question
Points
1 2 3 4 5 6 7 8
2/2 3/3 1/1 1/1 5/5 –/3 –/3 –/4
Total
12/22 (54.5%)

  • Instructions

    Precalculus with Calculus Previews, 6th edition, written by Dennis Zill and Jacqueline Dewar and published by Jones and Bartlett Learning, is an ideal undergraduate text to help students successfully transition into a future course in calculus. The sixth edition of this best-selling text presents the fundamental mathematics used in a typical calculus sequence in a focused and readable format. The WebAssign component for this text engages students with an interactive eBook and step-by-step question tutorials that facilitate learning.

    All questions include a link to the eBook.

    Question 1 demonstrates interval grading, which can grade any canonically equivalent interval and enforce proper notation. This question also shows how to graph the interval on the WebAssign NumberLine tool.

    Question 2 has a student enter the most simplified, complex form of the complex number.

    Question 3 uses the WebAssign graphing tool to graph a circle and shade in the inequality.

    Question 4 enforces that the student enters the equation of the circle in the standard form.

    Question 5 allows any form of the correct equations to be entered. This question also includes a multiple choice set of graphs.

    Question 6 uses special grading to ensure students enter the most simplified versions of the trigonometry answers.

    Question 7 asks the student to calculate the equation for the exponential model and then compute values associated with the model.

    Question 8 features a tutorial that steps the student through how to algebraically shift exponential functions, graph these functions, and then find points based on the graphs.

    View the complete list of WebAssign questions available for this textbook. This demo assignment allows many submissions and allows you to try another version of the same question for practice wherever the problem has randomized values.

    The answer key and solutions will display after the first submission for demonstration purposes. Instructors can configure these to display after the due date or after a specified number of submissions.

Assignment Submission

For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

Assignment Scoring

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1. 2/2 points  |  Previous Answers ZillPreCalc6 1.1.030. My Notes
Question Part
Points
Submissions Used
1 2
1/1 1/1
1/50 2/50
Total
2/2
 
Solve the given linear inequality. Write the solution set using interval notation.
2 < x + 7 ≤ 8
(−5,1]
Correct: Your answer is correct. webMathematica generated answer key

Graph the solution set.
Use the tools to enter your answer.
Created with Raphaël 2.1.0-6-5-4-3-2-10123456
Created with Raphaël 2.1.0

NO SOLUTION

Help
Correct: Your answer is correct.

Created with Raphaël 2.1.0-6-5-4-3-2-10123456
Created with Raphaël 2.1.0

NO SOLUTION

seenKey

(-5, 1]
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2. 3/3 points  |  Previous Answers ZillPreCalc6 3.3.509.XP. My Notes
Question Part
Points
Submissions Used
1 2 3
1/1 1/1 1/1
1/50 1/50 1/50
Total
3/3
 
Find
z1 + z2,
z1 − z2,
 and
z1z2
 for the given complex numbers. (Simplify your answers completely.)
z1 = 7 − 5i, z2 = 1 − i
z1 + z2 = 
8−6i
z1 − z2 = 
6−4i
z1z2 = 
2−12i
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3. 1/1 points  |  Previous Answers ZillPreCalc6 1.4.033. My Notes
Question Part
Points
Submissions Used
1
1/1
1/50
Total
1/1
 
Sketch the set of points in the xy-plane whose coordinates satisfy the given inequality.
4 ≤ x2 + y2 ≤ 25
No Solution
Help
-5
-4
-3
-2
-1
1
2
3
4
5
-5
-4
-3
-2
-1
1
2
3
4
5
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4. 1/1 points  |  Previous Answers ZillPreCalc6 1.4.077. My Notes
Question Part
Points
Submissions Used
1
1/1
2/50
Total
1/1
 
The circle in the figure below has radius r. What is its equation in standard form?
(x−r)2+(y−r)2=r2
Correct: Your answer is correct. webMathematica generated answer key
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5. 5/5 points  |  Previous Answers ZillPreCalc6 3.6.011. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5
1/1 1/1 1/1 1/1 1/1
1/50 1/50 1/50 1/50 2/50
Total
5/5
 
Find the vertical and horizontal asymptotes for the graph of the given rational function. (Enter your answers as comma-separated lists of equations. If an answer does not exist, enter DNE.)
f(x) = 
16
(x − 4)2
vertical asymptote(s)
x=4
horizontal asymptote(s)     
y=0

Find x- and y-intercepts of the graph. (If an answer does not exist, enter DNE.)
x-intercept     (x, y) =
DNE
y-intercept     (x, y) =
0,1

Sketch the graph of f.

Correct: Your answer is correct.
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6. –/3 points ZillPreCalc6 4.2.020. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/50 0/50 0/50
Total
–/3
 
For the given value of t determine the reference angle t ' and the exact values of sin(t) and cos(t). Do not use a calculator.
t = 7π/6
t ' =
radians
sin(t) =
cos(t) =
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7. –/3 points ZillPreCalc6 6.4.006. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/50 0/50 0/50
Total
–/3
 
In genetic research a small colony of drosophila (small two-winged fruit flies) is grown in a laboratory environment. After 4 days it is observed that the population of flies in the colony has increased to 100. After 9 days the colony has 200 flies.
(a) Find a model
P(t) = P0ekt
 for the population of the fruit-fly colony after t days. (Round your values for P0 and k to two decimal places.)
P(t) =


(b) What will be the population of the colony in 18 days? (Round your answer to the nearest integer.)
P(18) =
flies

(c) When will the population of the colony be 5000 fruit flies? (Round your answer to one decimal place.)
t =
days
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8. –/4 points ZillPreCalc6 6.1.522.XP.Tut. My Notes
Question Part
Points
Submissions Used
1 2 3 4
–/1 –/1 –/1 –/1
0/50 0/50 0/50 0/50
Total
–/4
 
The graph of
m(x)
 is identical to the graph of
f(x) = 2x,
 but shifted five units right. The graph of
n(x)
 is identical to the graph of
g(x) = x2,
 but shifted five units right and one unit up.
(a) State the equations of
m(x)
 and
n(x).

m(x) = 
n(x) = 


(b) Use a graph to determine the two points where
m(x)
 and
n(x)
 intersect for
0 ≤ x ≤ 8.

(x, y) = 
 (smaller x-value)
(x, y) = 
 (larger x-value)
Tutorial
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